A LIMNOLOGICAL STUDY OF THE FINGER LAKES. 
567 
It is ascertained, like the mean depth of the lake, by dividing the volume of the water 
of the region by the area of the surface. The reduced thickness of the region thus 
differs from its mean thickness in that the reduced thickness of the region is in all cases 
referred to the area of the surface of the lake, while the mean thickness of a given stratum 
would be its thickness referred (ordinarily) to its own upper boundary plane. Table 
XII shows the distribution of the calories received by a unit of the surface of the six 
major lakes to their thermal regions. 
Table XII. — Showing Extent and Reduced TmcKNEss of the Three Thermal Regions in the 
Six Major Lakes, Their Temperature, and the Number of Calories per Square Centi- 
meter OF Surface of the Lake Distributed to Each Region. 
[The sums of the calories in each lake may differ slightly from those given in the general table, owing to the different method 
of computation.] 
Region, 
Canandaigua Lake 
1910. 
Epilimnion 
Thermocline 
Hypolimnion 
Canandaigua Lake 
1911. 
Epilimnion 
Thermocline 
Hypolimnion 
Cayuga Lake, 1910 
Epilimnion 
Thermocline 
Hypolimnion 
Cayuga Lake, 1911 
Epilimnion 
Thermocline 
Hypolimnion 
Keuka Lake, 1910. 
Epilimnion.... 
Thermocline . . 
Hypolimnion. 
Keuka Lake, 1911 
Epilimnion 
Thermocline 
Hypolimnion 
Ex- 
tent. 
Meters. 
0-12 
12-20 
20-84 
0-12 
12-20 
20-84 
0-15 
15-22 
22-133 
0-16 
16-21 
21-133 
0-9 
9-15 
15-56 
o-ii 
11-18 
18-56 
R.T. 
Meters. 
10. o 
5-6 
23. 1 
38- 7 
10. o 
5-6 
23. 1 
38. 7 
II. 8 
4. 62 
38.3 
12. 5 
3-3 
38.7 
8.4 
4.9 
17- 2 
10. o 
5-4 
15 - I 
Tm-4. 
16. 8 
9-3 
2- 73 
15 - S 
9. 2 
I. 04 
15 - 5 
10.3 
1,41 
5 - 26 
IS- 2 
9. 2 
1. 14 
16. 8 
9. 2 
3-45 
8.17 
16. 2 
7.8 
I. 68 
7. 48 
Calo- 
ries. 
16,800 
5, 200 
5> 200 
i 5 » 5 oo 
5, 200 
2, 400 
18,300 
4,800 
5»400 
28, 500 
19,000 
3 ; 300 
4,400 
26, 700 
14. 100 
4 » 5 °o 
6, 300 
16, 200 
4, 100 
2, 500 
Per 
cent. 
61. 9 
19 . 1 
19. o 
66.4 
22. o 
II. 6 
64. 2 
16. 9 
18. 9 
71. I 
12. 4 
16. 5 
56. 6 
18. 1 
25-3 
71. o 
18. o 
II. o 
22,800 
Region. 
Owasco Lake. 1910 
Epilimnion 
Thermocline 
Hypolimnion 
Owasco Lake, 1911 
Epilimnion 
Thermocline 
Hypolimnion 
Seneca Lake, 1910 
Epilimnion 
Thermocline 
Hypolimnion 
Seneca Lake. 1911 
Epilimnion 
Thermocline 
Hypolimnion 
Skaneateles Lake 
1910. 
Epilimnion 
Thermocline 
Hypolimnion 
Skaneateles Lake 
1911. 
Epilimnion 
Thermocline 
Hypolimnion 
Ex- 
tent. 
Meiers. 
0-12 
12-20 
20-54 
0-12 
12-20 
20-54 
0-12 
12-20 
20-188 
0-15 
15-22 
22-188 
0-9 
9-18 
18-90 
0-16 
16-22 
22. 90 
R. T. 
Meters. 
10. 6 
5*6 
13 - 1 
29-3 
10. 6 
5-6 
13 - 1 
II - 5 
6. 2 
70.9 
88.6 
13-8 
6. o 
68.8 
8.0 
6-5 
29. o 
13-0 
4 - 2 
26. 3 
Tm-4.; 
Calo 
16. 3 
9.9 
4. o 
15- 9 
10. 6 
17^300 
5»6oo 
5,200 
28, 100 
16, 800 
6, 000 
3, 200 
26,000 
IS - 4 
10. 2 
I. 21 
15-4 
8.6 
IS- 5 
10. 4 
I. 82 
6 . 74 
17, 700 
6, 400 
8,800 
21, 200 
5,200 
3>300 
12, 500 
6. 600 
7. 600 
26, 700 
20, 200 
4f300 
4.700 
Per 
cent. 
61. 6 
19. 7 
18. 7 
64. 5 
22. 8 
12. 7 
53-8 
19-5 
21. 7 
71-5 
17 - 5 
II. o 
46.9 
24. 7 
28. 4 
67.8 
14.4 
17.8 
